metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically during mountain-building events.
Uses & applications
Used widely in construction for road aggregate, railway ballast, dimension stone, and manufactured countertops due to its extreme durability.
Geological facts
Quartzite is harder than the original sandstone it formed from and will fracture through quartz grains rather than around them.
Field identification & locations
Identified easily by its inability to be scratched by a steel knife and lack of effervescence with hydrochloric acid; found globally in mountainous or ancient craton regions.
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